/*
* This file is part of Project SkyFire https://www.projectskyfire.org.
* See LICENSE.md file for Copyright information
*/

#ifndef SKYFIRESERVER_PATH_H
#define SKYFIRESERVER_PATH_H

#include "Common.h"
#include <deque>

struct PathNode
{
    PathNode() : x(0.0f), y(0.0f), z(0.0f) { }
    PathNode(float _x, float _y, float _z) : x(_x), y(_y), z(_z) { }
    float x, y, z;
};
template<typename PathElem, typename PathNode = PathElem>

class Path
{
public:
    size_t size() const { return i_nodes.size(); }
    bool empty() const { return i_nodes.empty(); }
    void resize(unsigned int sz) { i_nodes.resize(sz); }
    void clear() { i_nodes.clear(); }
    void erase(uint32 idx) { i_nodes.erase(i_nodes.begin() + idx); }
    void crop(unsigned int start, unsigned int end)
    {
        while (start && !i_nodes.empty())
        {
            i_nodes.pop_front();
            --start;
        }

        while (end && !i_nodes.empty())
        {
            i_nodes.pop_back();
            --end;
        }
    }

    float GetTotalLength(uint32 start, uint32 end) const
    {
        float len = 0.0f;
        for (uint32 idx = start + 1; idx < end; ++idx)
        {
            PathNode const& node = i_nodes[idx];
            PathNode const& prev = i_nodes[idx - 1];
            float xd = node.x - prev.x;
            float yd = node.y - prev.y;
            float zd = node.z - prev.z;
            len += sqrtf(xd * xd + yd * yd + zd * zd);
        }
        return len;
    }

    float GetTotalLength() const { return GetTotalLength(0, size()); }

    float GetPassedLength(uint32 curnode, float x, float y, float z) const
    {
        float len = GetTotalLength(0, curnode);

        if (curnode > 0)
        {
            PathNode const& node = i_nodes[curnode - 1];
            float xd = x - node.x;
            float yd = y - node.y;
            float zd = z - node.z;
            len += sqrtf(xd * xd + yd * yd + zd * zd);
        }

        return len;
    }

    PathNode& operator[](size_t idx) { return i_nodes[idx]; }
    PathNode const& operator[](size_t idx) const { return i_nodes[idx]; }

    void set(size_t idx, PathElem elem) { i_nodes[idx] = elem; }

protected:
    std::deque<PathElem> i_nodes;
};

typedef Path<PathNode> SimplePath;

#endif
